I use wooden houses...use to have barrels, but you cant take the top off one!
I have one barrel left and usually lowman on the totem pole gets it, honestly.
My single chambered ones are made like this...[attachment=1:3ad2zsd4]Doghouse.jpgDoghouse.jpg[/attachment:3ad2zsd4][attachment=0:3ad2zsd4]Doghouse2.jpg[/attachment:3ad2zsd4]

Find a laid off carpenter or someone who's good with building
see if they want to make some side money